<template>
  <div>
    <h2>当前求和为：{{ sum }}</h2>
    <h3>放大十倍后为:{{ bigSum }}</h3>
    <h3>我在{{ school }},学习{{ subject }}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
import { mapState, mapGetters } from "vuex";
export default {
  name: "Count",
  data() {
    return {
      n: 1,
    };
  },
  methods: {
    increment() {
      this.$store.commit("JIA", this.n);
    },
    decrement() {
      this.$store.commit("JIAN", this.n);
    },
    incrementOdd() {
      this.$store.dispatch("jiaOdd", this.n);
    },
    incrementWait() {
      this.$store.dispatch("jiaWait", this.n);
    },
  },
  computed: {
    /*
    自己写计算属性
   sum() {
      return this.$store.state.sum;
    },
    bigSum() {
      return this.$store.getters.bigSum;
    },
    school() {
      return this.$store.state.school;
    },
    subject() {
      return this.$store.state.subject;
    }, */

    //借助mapState生成计算属性，从state中读取数据。（对象写法）
    ...mapState({
      sum: "sum",
      school: "school",
      subject: "subject",
    }),
    ...mapGetters(["bigSum"]),
    //借助mapState生成计算属性，从state中读取数据。（数组写法）
    //   ...mapState(["sum", "school", "subject"]),
    //   ...mapGetters(["bigSum"]),
  },
};
</script>

<style>
button {
  margin-left: 10px;
}
</style>